Means for rebushing pistons



June 22 1926. 1 1,589,633

G. DUNTON ET AL MEANS FOR REBUSHING PISTONS Filed April 29, 1924 I NY E NTORJ 6207p? Dz/)2 to l (fie/2 20 w; on

Jay J:

Patented June 22, 1926.

1,589,633 PATENT OFFICE.

GEORGE DUNTON AND CHARLES ,DAWSON, OF SANTA ANA, CALIFORNIA.

MEANS FOR REBUSHING PISTONS.

Applioation'iled April 29, 1924. Serial 1T0. 709,879.

This invention relates to a method and means for rebushing pistons.

An object of the invention is to provide a simple form of the device which will tacilitate removal of worn bushings from PIS- tons and also facilitate the insertion of a new bushing in the piston, the device being provided with means for automatically terminating the distance at which the bushing may be inserted into the piston and rovided with means for forcing the bushlngs out of the piston without placing strains upon the piston which might operate to fracture the same.

Another object of the invention is to provide a simple method of rebushing the piston by which a piston may be rebushed in a short period off-time without danger of damage to the piston.

Various other objects and advantages of the invention will be apparent from the description of a preferred method and means of rebushing a piston, for which purpose reference is made to the accompanying drawings forming part of the disclosure of the invention and in which a device to embody the invention is shown in its preferred form.

In the drawings:

Figure 1 is an elevation partially in ver tical section of the rebushing device showing a piston in the rebushing process.

Fig 2 is an elevation similar to Figure 1 with the piston in a later stage of the re bushing process.

Fig. 3 1s a perspective of the stand of the rebushing device. V

Fig. 4 is an elevation of one of the appurtenances for-the stand.

Fig. 5 is a top perspective view of a member employed with the rebushing stand.

Fig. 6 is a perspective of a guide sleeve em loyed in the rebushing device, and

ig. 7 is a perspective of a guide and bushing removing member.

Referri to the drawings:

The device comprises a stand 1 or other means for su porting an upwardly extending stem 2, t e stem having two step portions 3 and 4; the section 4 being the lower section has an outside diameter adapted to fairly closel fit within a bushing 5 of the piston 6, which is to be rebushed. The upper portion 3 of the stem is of reduced dlameter and between the sections 3and 4 the stem is provided with a flat upwardly extending face or annular shoulder 7.

Now referring first to Fig. 1when it is desired to rebush a piston such as indicated by 6, the piston is inserted first down on the stem 2, so that. thelower bushing 5 of the piston slides over the enlarged stem portion 4. There is then inserted through one of the open ends of the piston a bushing contact and guide member 8, which is provided with an opening 9 in its lower end, as viewed in Fig. 1, said opening 9 being shaped to closely fit the end of the stem portion 3. The lower section 10 of the bushing contact and guide member 8 is of a diameter substantially equal to the diameter of the bore of the hub 11 of the piston receiving the bushing 5, and the upper section 12 of the bushing contact and guide member being of a diameter to fit closely within the bushing 5. The bushing contact and guide member 8 thus is provided with an annular shoulder 13, which is adapted to engage the end of the bushing 5 in forcing the bushings into or out of the piston, the upper section 12 of the member guiding the bushing during the removing and replacing operation, whereas the lower section 9 of the member engages within the bore 11 of the piston to guide the piston during part of the operations.

At this step of the rebushing operations such contact and guide member 8 1s placed on the stem 2 as shown in Fig. 1 and then the piston 6 further lowered down on the stem 2 until the lower end of the upper bushing 5 of the piston engages the shoulder 13 of the contact and guide member 8. The piston is then in position for removal of the upper bushing 5. Preferabl in removing such upper bushing 5, a ammer sleeve 14 is placed upon the top side of the piston, such hammer sleeve 14 havin a greater interior diameter than the exterior diameter of the bushing 5, and the minimum height of the sleeve 14 is greater than that of the bushing 5. As shown in Figure 4, such hammer sleeve has its lower end 15 arched to conform to the outside curvature of the piston 6. The piston 5 can then be removed by hammering or otherwise forcing the hammer sleeve 14 down against the piston 6. The bushing contact member 8 during this operation passin through the upper bore 11 receiving the ushing 5, the

contact and guide member 8 forcing the bushing before it and out of the piston. It will be seen that the force applied through the hammer sleeve 14 is e enly distributed over that portion of the piston reinforced at the bushing and hence no strain is placed upon the piston which will tend to fracture the same.

The iston 6 may then be reversed in place upon t e stem 2 so as to remove the other bushing 5 of the piston or, if desired, a

new bushing may be'inserted in the piston without removing the other bushing. In

piston over the end of the stem 2.

case it is desired to remove both bushings 5 from the piston without first replacing a new bushing therein, a split sleeve or bushing 16 is placed on the lower section 4 of the stem in order to provide a guide for the piston during such operation, such split bushing or sleeve being shown in Figures 2 and (3. When it is desired to insert a bushing into the bore 11 of the piston, the piston 6 is raised somewhat on the stem 2 so that the stop member 17 shown in Figures 2 and 5 may be inserted endwise through the Such stop member 17 is provided with a bore 18 closely fitting the exterior of the upper section 3 of the stem. and thus is adapted to be supported on the shoulder 7 of the stem. The stop member 17 has an outside diameter equal to that of the hub 11 of the piston receiving the bushing and thus is designed to engage the lower end of such hub 11 and hold the piston in set position on the stem 2. The upper face of the stop member 17 is recessed as indicated at 19 so that the bushing 5 maybe lowered slightly below the end of the hub of the piston, the recess 19 being of the desired depth to permit the bushing 5 to be inserted the proper distance within the piston and is operative to stop the insertion of such a bushing 5 at this position. As shown in Figure 2, the new bushing is inserted into the piston from the upper side ofthe piston being forced therein by the bushing contact and guide member 8, such member being reversed in position so as to engage the upper end of the bushing for this operation.

By the method and means for rebushing a piston herein described, a piston may be rapidly rebushed without the necessity of expensive devices for such purpose and w thout danger of dams to the piston. While the method and dzvice herein described is well suited for the urposes of this invention, it is not intend ed to limit the invention to the. details of the method or device, as various modifications may be made in the details of the device or method without departing from the spirit of the invention. The invention is of the scope set forth in the appended claims.

We claim 1. In a device for rebushing a piston, the combination of a piston su porting stem having sections of different iameters with an upturned shoulder provided between the sections, a base for supporting said stem in a vertical position, a sto member supported upon the shoulder 0 said stem and adapted to engage the lower end of the hub of the piston for limiting the insertion of a bushing into said piston, means for supporting said stem and stop member with the bushing thereon, and a contact and guide member adapted to be forced with a bushing longitudinally into said hub.

2. In a device for rebushing a piston, the combination of a stem, means for supporting said stem in a vertical position, such stem, having sections of different diameters, one of said sections being adapted to guide said piston rduring rebushing operations, the end of the other section being adapted to su port a bushing contact member, and a bushing contacting member adapted to be supported on the end of said stem and movable through the hub of the piston provided with the bushing to be removed.

3. A device for rebushing a piston, comprising a vertical stem, means for supporting said vertical stem, such vertical stem having a reduced end formin a shoulder, the stem being adapted to guidably support a piston during a rebushing operation, and a member fitted over said reduced end and supported on said shoulder, said member being adapted to limit the insertion of a bushing into said piston.

Signed at Santa Ana, Calif., this 21st day of April 1924. 

